Im new to the site and have owned a used 99 2500 quad cab ctd since 2000. Its sad to say after 4 years i dont know much about diesel moters. I am looking to get more millage and moderite power gains for the truck but im not really sure what to go with since there seems to be about a million thing i can get for the truck. Any suggestions would be appreciated. Sorry about the spelling if there are any mistakes i tried hooked on phonix but i couldnt read the directions.